Method of producing concrete structures



Patented Oct. 29, 1929 UNITED STATES AUGUST n. scHU'r'rE, or Non'THBoRo,y1vrAssacHus`Errs METHOD OF PRODUCING Appucatin sied March 7,

The improvement refers especially to concrete which has been coated,impregnated, or saturated with an asphaltic like waterproofingsubstance.

By my process, plain or reinforced piles are saturated with a bituminouscement, by creating, in a channel formed at the center of the pile, avacuum which not only withdraws all the moisture and steam formed lduring that treatment, but also by suction causes the bituminousmaterial to lill all voids and spaces in the concrete forming the pile.It is obvious that not only can there be created a vacuum in the centerof the pile, but that the whole pile can be placed in a receptacle andpressure applied so that the waterproofing material is not only drawn inby the vacuum formed in the center of the pile but is also forced infrom the outside by the increased pressure in the cylinder or tankcontaining the bituminous composition as well as the pile. Againit isobvious that instead of forming a vacuum in the pile I can reverse theprocess and pump the heated material into the center of the pile andforce it by ressure from the center to the outside of the structure thusfilling all its voids.

In order to manufacture the piles under my process, there is placed inthe pile one or more perforated pipes or perforated mandrels forming acentral passage having openings all along the inner wall. Such anarrangement s shown in the annexed drawing and in which l denotes aconcrete body or pile and 2 a perforate pipe or mandrel extendinglongitudinally thereof. After the structure has been cured, the pile isimmersed in a vat or tank containing the heated asphalt, a suction pumpis connected by suitable means to the end of the pipe (or pipes) and avacuum formed which will cause the ow of the waterproofing materialcentrally into the open passage until all pores and voids are filled. Itwill be understood of course that the pump may be attached previous toimmersion.

lVith some structures it is advantageous to reverse the process and pumpthe hot material into the interior kof the structure while the same iseither immersed or not inthe same medium, or, as stated before, thepressure ooNoRn'rE srnuo'rnnns f 192s. serial No, 259,929.

could be applied by suitable means from the outside while a vacuum isformed inside, or a vacuum formed outside while the waterproofing mediumis forced into the inside.

In the broader aspect of the invention the pipe or mandrel may bewithdrawn and pressure or vacuum established within the rpile byinserting a suitable perforate closure in the opening left in the pileto which the suction or vacuum pump may be attached. no f I am awarethat attempts are being made in numerous ways to saturate and impregnatepiles, or similar struc/tures, with water-proofing material such asasphalt, but I am not aware of' any impregnated structure in which miVthe impregnating process was conducted under less or more than anatmospheric pressure, or by a combination of both.

What is claimed is:

l. A method of forming and saturatingl'lotw concretefstructures whichconsists in casting the structure with an opening therein; allowing suchstructure to cure; immersing they cured structure ina tank of liquidasphalt; i and `finally effecting a differential ,iny pres- I5 surebetween the exterior surface of the structure and the wall oftheopening. n

2. A method of forming and saturatingr concrete structures whichconsists in casting f the structure about a perforate mandrel; al- .80lowing the structure yt0 cure; immersing the cured structure in a bodyof molten asphalt; and finally creating a dilferentialinfpressurebetween the outer surface of the structure and the interior of themandrel.

8. A method of forming and saturating concrete structures which consistsin casting the structure with an opening extending longitudinallythereof; allowing such structure to cure; immersing the cured structurein a tank of liquid asphalt; and finally kforeing liquid asphalt underpressure into the opening. y

4. A method of forming and saturating concrete structures whichkconsists in casting the structure about a perforate mandrel; allowingthe structure to cure; immersing the oured structure in a body of moltenasphalt; forcing molten asphalt into the perforate mandrel; andsimultaneously lowering the pressure upon the surface o the bodysurrounding the structure.

5. That method of forming and saturating concrete structures whichconsists of casting 5 the structure with an opening extendingtherethrough; allowing such structure to cure; immersing the curedstructure in a body of molten asphalt 5: and finally setting up adifferential pressure between the exterior sur i 10 face of thestruoture and the Wall of the openin l ln' testimony Whereor` I havesigned my neme to this specification'.

AUGUST E. SCHUTTE-

